CVE-2026-93848

Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774

Score

CVSS 3.1 2.7 Low

Status

Awaiting Analysis - responsibledisclosure@mattermost.com

Published

2026-10-26

Last modified

2026-10-26

Weaknesses

CWE-918

Affected products

• Mattermost (Mattermost)

References

• https://mattermost.com/security-updates